My feet armature looks off center in pose mode but fine in edit mode. Why?
There are 2 reasons here why the bones position is not the same in Edit and Pose mode.
First off, you've moves the bones in Pose mode. To reset select all bones and press AltG (AltS and AltR to reset scale and rotation).
The second thing is that IK bones will always point towards their controller (i.e. their Target) as soon as you switch to Pose mode, you'll see what I mean. For example for the bone called Angle.L the target is the bone called Ankle_IK.L:

if you enable and disable the Ik constraints:

So if you don't want the IK bone to move when you switch into Pose mode, you need to correctly align its target in Edit mode (or align it to its target):

Note that as you have a chain of several IK bones you'll need to do it for all of them.